1. G.I. Budker and G.I. Dimov, In: Transactions of the International Conference on Accelerators p. 993 (Dubna, 1963), [in Russian], Moscow, Atomizdat (1964).
2. G.I. Budker et al., Atomnaya Énergiya,19, 507 (1965).
3. V.L. Auslender et al., Atomnaya Énergiya,20, 210 (1966).
4. É.A. Zhil'kov and A.N. Lebedev, Steady-state conditions of particle acceleration in the presence of space charge. Report to the Intercollegiate Conference on Electron Accelerators, (Tomsk, 1966).
5. I.M. Samoilov and A.A. Sokolov, ZhTF,35, 2012 (1965).